问题
Is it possible to find out volume label of SD card inserted into Android device?
I understand that Android is designed to have just one "external storage" (as returned by Environment.getExternalStorageDirectory()), but there are quite a few devices in the wild that have internal flash as "external storage" and an SD card mounted under that or even wilder combinations (see this other question). It is possible to enumerate these additional devices by reading /proc/mounts, but we need something to identify them to the user. Is there any chance to get to their volume labels?
I checked that Linux vfat driver ignores the volume label dentry altogether and that blkid from util-linux reads the vfat itself. I also checked that, at least on device I have, the block device of the SD card has mode 660 and owner root.root, so I can't do that. So basically it boils down to whether there is any utility that could read it available.
回答1:
I have found a solution.
The easiest solution is to build busybox and use it like this: busybox blkid
Complicated solution is to find blkid for Android and find what you need in its source code (blkid_dev_devname function).
回答2:
i don't know how it works exactly in android, but in linux i have kernel message about mounting sd-card, where volume name specified. You can try dmesg and cat /sys/devices/mmc... (or somethong like that)
回答3:
Try to parse output of blkid command. It works for me, but I'm not sure if it is a firmware depended feature or not. I got permission denied with this command on AVD.
回答4:
I don't know if this can help you: if you use the DDMS you can see the folders of the system. In my case, I found the sd card in: /mnt/media_rw.
You can get more information here and here
I hope it helps.
来源：https://stackoverflow.com/questions/8151779/find-sd-card-volume-label-on-android